由上皮及间叶两个胚叶构成，状似胚胎肺。
Histologically they looked like the embryonic lung consisted of epithelial and mesenchymal elements.
大多数禾本科胚有一片瓣状结构通常称为外胚叶。
Most grass embryos have a flap-like structure known as the epiblast.
目的：研究少汗性外胚叶发育不全引起先天缺牙的ED1基因突变。
Objective: To detect ED1 gene mutation in three hypohidrotic ectodermal dysplasia (HED) nuclear families.
应用推荐